well,you have two choices!
one,you never call if and wonder for the rest of your life...
two,you call him and find out!at least this way,you will find out whether he wants you or not.
well,here's what i would do,i'd call him and tell him that i found his number on the internet and that i was his son....there will be a long pause from your father here....then i would tell him that i want to see him!and that's that!the ball would be in his court then!
if he doesn't want to see you,then it's his loss,cause YOU babe tried!
but it's better to know then to wonder about it for the rest of your life!
Hope i helped you,babe!